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        <li class="header">第 Ⅰ 部分：PostGIS基础</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
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        <li class="chapter " data-level="1.2" >
            
                <span>
            
                    
                    一 初识PostGIS
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.1" data-path="../../introduction/PostgisAbility.html">
            
                <a href="../../introduction/PostgisAbility.html">
            
                    
                    1.1 PostGIS特性
            
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        <li class="chapter " data-level="1.2.2" data-path="../../introduction/PostgisAbility.html">
            
                <a href="../../introduction/PostgisAbility.html">
            
                    
                    1.2 PostGIS使用场景
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.2.1" data-path="../../installation/PostgreSQL Installation.html">
            
                <a href="../../installation/PostgreSQL Installation.html">
            
                    
                    1.2.1 适用场景
            
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        <li class="chapter " data-level="1.2.2.2" data-path="../../installation/PostGIS Installation.html">
            
                <a href="../../installation/PostGIS Installation.html">
            
                    
                    1.2.2 不适用场景
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../../introduction/PostgisAbility.html">
            
                <a href="../../introduction/PostgisAbility.html">
            
                    
                    1.3 PostGIS使用建议
            
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        </li>
    
        <li class="chapter " data-level="1.2.4" >
            
                <span>
            
                    
                    1.4 PostGIS安装
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="1.2.4.1" data-path="../../installation/PostgreSQL Installation.html">
            
                <a href="../../installation/PostgreSQL Installation.html">
            
                    
                    1.4.1 PostgreSQL安装
            
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        </li>
    
        <li class="chapter " data-level="1.2.4.2" data-path="../../installation/PostGIS Installation.html">
            
                <a href="../../installation/PostGIS Installation.html">
            
                    
                    1.4.2 PostGIS安装
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.2.5" data-path="../../introduction/ReleaseNotes.html">
            
                <a href="../../introduction/ReleaseNotes.html">
            
                    
                    1.5 PostGIS重大版本
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.3" >
            
                <span>
            
                    
                    二 PostGIS入门
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.3.1" >
            
                <span>
            
                    
                    2.1 客户端介绍
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.3.1.1" >
            
                <span>
            
                    
                    2.1.1 psql
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.1.2" >
            
                <span>
            
                    
                    2.1.2 qgis
            
                </span>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.3.2" >
            
                <span>
            
                    
                    2.2 空间数据库
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.3" >
            
                <span>
            
                    
                    2.3 数据导入
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.3.3.1" >
            
                <span>
            
                    
                    2.3.1 shp
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.3.2" >
            
                <span>
            
                    
                    2.3.2 csv
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.3.3.3" >
            
                <span>
            
                    
                    2.3.3 excel
            
                </span>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">第 Ⅱ 部分：API手册</li>
        
        
    
        <li class="chapter " data-level="2.1" >
            
                <span>
            
                    
                    八 矢量函数
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" >
            
                <span>
            
                    
                    8.2 空间表管理
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1.1" data-path="../TableManager/AddGeometryColumn.html">
            
                <a href="../TableManager/AddGeometryColumn.html">
            
                    
                    8.2.1 AddGeometryColumn
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.1.2" data-path="../TableManager/DropGeometryColumn.html">
            
                <a href="../TableManager/DropGeometryColumn.html">
            
                    
                    8.2.2 DropGeometryColumn
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.1.3" data-path="../TableManager/DropGeometryTable.html">
            
                <a href="../TableManager/DropGeometryTable.html">
            
                    
                    8.2.3 DropGeometryTable
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.1.4" data-path="../TableManager/Find_SRID.html">
            
                <a href="../TableManager/Find_SRID.html">
            
                    
                    8.2.4 Find_SRID
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.1.5" data-path="../TableManager/Populate_Geometry_Columns.html">
            
                <a href="../TableManager/Populate_Geometry_Columns.html">
            
                    
                    8.2.5 Populate_Geometry_Columns
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.1.6" data-path="../TableManager/UpdateGeometrySRID.html">
            
                <a href="../TableManager/UpdateGeometrySRID.html">
            
                    
                    8.2.6 UpdateGeometrySRID
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.1.2" >
            
                <span>
            
                    
                    8.4 元数据读写
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.2.1" data-path="../Accessors.html">
            
                <a href="../Accessors.html#GeometryType">
            
                    
                    GeometryType
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.2" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_GeometryType">
            
                    
                    ST_GeometryType
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.3" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_CoordDim">
            
                    
                    ST_CoordDim与ST_NDims
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.4" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Dimension">
            
                    
                    ST_Dimension
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.5" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Zmflag">
            
                    
                    ST_Zmflag
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.6" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_HasArc">
            
                    
                    ST_HasArc
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.7" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsPolygonCCW">
            
                    
                    ST_IsPolygonCCW
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.8" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsPolygonCW">
            
                    
                    ST_IsPolygonCW
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.9" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsClosed">
            
                    
                    ST_IsClosed
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.10" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsCollection">
            
                    
                    ST_IsCollection
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.11" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsEmpty">
            
                    
                    ST_IsEmpty
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.12" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsRing">
            
                    
                    ST_IsRing
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.13" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_IsSimple">
            
                    
                    ST_IsSimple
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.14" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Boundary">
            
                    
                    ST_Boundary
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.15" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Envelope">
            
                    
                    ST_Envelope
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.16" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_BoundingDiagonal">
            
                    
                    ST_BoundingDiagonal
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.17" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_X">
            
                    
                    ST_X,ST_Y,ST_Z,ST_M
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.18" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_StartPoint">
            
                    
                    ST_StartPoint,ST_EndPoint
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.19" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_NumGeometries">
            
                    
                    ST_NumGeometries,ST_GeometryN
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.20" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_NRings">
            
                    
                    ST_NRings,ST_ExteriorRing,ST_NumInteriorRings,ST_NumInteriorRing,ST_InteriorRingN
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.21" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_NumPatches">
            
                    
                    ST_NumPatches,ST_PatchN
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.22" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_NPoints">
            
                    
                    ST_NPoints,ST_NumPoints,ST_PointN,ST_Points
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.23" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_MemSize">
            
                    
                    ST_MemSize
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.24" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Summary">
            
                    
                    ST_Summary
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.2.25" data-path="../Accessors.html">
            
                <a href="../Accessors.html#ST_Dump">
            
                    
                    ST_Dump,ST_DumpPoints,ST_DumpRings
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.1.3" >
            
                <span>
            
                    
                    8.11 空间关系
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.3.1" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Intersects">
            
                    
                    ST_Intersects
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.2" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Intersects">
            
                    
                    ST_Disjoint
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.3" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Contains">
            
                    
                    ST_Contains
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.4" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Contains">
            
                    
                    ST_Within
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.5" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Equals">
            
                    
                    ST_Equals
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.6" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_ContainsProperly">
            
                    
                    ST_ContainsProperly
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.7" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Covers">
            
                    
                    ST_Covers
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.8" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Covers">
            
                    
                    ST_CoveredBy
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.9" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Overlaps">
            
                    
                    ST_Overlaps
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.10" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Overlaps">
            
                    
                    ST_Crosses
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.11" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Touches">
            
                    
                    ST_Touches
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.12" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_Relate">
            
                    
                    ST_Relate
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3.13" data-path="../SpatialRelationships.html">
            
                <a href="../SpatialRelationships.html#ST_RelateMatch">
            
                    
                    ST_RelateMatch
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.1.4" >
            
                <span>
            
                    
                    8.12 空间测量
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.4.1" data-path="../Measurement/ST_3DClosestPoint.html">
            
                <a href="../Measurement/ST_3DClosestPoint.html#ST_3DClosestPoint">
            
                    
                    ST_3DClosestPoint
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.2" data-path="../Measurement/ST_3DDistance.html">
            
                <a href="../Measurement/ST_3DDistance.html">
            
                    
                    ST_3DDistance
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.3" data-path="../Measurement/ST_Angle.html">
            
                <a href="../Measurement/ST_Angle.html">
            
                    
                    ST_Angle
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.4" data-path="../Measurement/ST_Area.html">
            
                <a href="../Measurement/ST_Area.html">
            
                    
                    ST_Area
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.5" data-path="../Measurement/ST_Azimuth.html">
            
                <a href="../Measurement/ST_Azimuth.html">
            
                    
                    ST_Azimuth
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.6" data-path="../Measurement/ST_ClosestPoint.html">
            
                <a href="../Measurement/ST_ClosestPoint.html">
            
                    
                    ST_ClosestPoint
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.7" data-path="../Measurement/ST_Distance.html">
            
                <a href="../Measurement/ST_Distance.html">
            
                    
                    ST_Distance
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4.8" data-path="../Measurement/ST_Project.html">
            
                <a href="../Measurement/ST_Project.html">
            
                    
                    ST_Project
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.1.5" >
            
                <span>
            
                    
                    8.14 仿射变换
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.5.1" data-path="../AffineTransformations/ST_Affine.html">
            
                <a href="../AffineTransformations/ST_Affine.html#ST_Affine">
            
                    
                    ST_Affine
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.2" data-path="../AffineTransformations/ST_Rotate.html">
            
                <a href="../AffineTransformations/ST_Rotate.html">
            
                    
                    ST_Rotate
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.3" data-path="../AffineTransformations/ST_RotateX.html">
            
                <a href="../AffineTransformations/ST_RotateX.html">
            
                    
                    ST_RotateX
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.4" data-path="../AffineTransformations/ST_RotateY.html">
            
                <a href="../AffineTransformations/ST_RotateY.html">
            
                    
                    ST_RotateY
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.5" data-path="../AffineTransformations/ST_RotateZ.html">
            
                <a href="../AffineTransformations/ST_RotateZ.html">
            
                    
                    ST_RotateZ
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.6" data-path="../AffineTransformations/ST_Scale.html">
            
                <a href="../AffineTransformations/ST_Scale.html">
            
                    
                    ST_Scale
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.7" data-path="../AffineTransformations/ST_Translate.html">
            
                <a href="../AffineTransformations/ST_Translate.html">
            
                    
                    ST_Translate
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5.8" data-path="../AffineTransformations/ST_TransScale.html">
            
                <a href="../AffineTransformations/ST_TransScale.html">
            
                    
                    ST_TransScale
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="2.1.6" >
            
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                    8.15 空间聚类
            
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                    ST_ClusterDBSCAN
            
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                    ST_ClusterIntersecting
            
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                    ST_ClusterKMeans
            
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                    ST_ClusterWithin
            
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                    8.16 线性参考
            
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        <li class="chapter " data-level="2.1.7.1" data-path="ST_LineInterpolatePoint.html">
            
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                    ST_LineInterpolatePoint
            
                </a>
            

            
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                    ST_3dLineInterpolatePoint
            
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                    ST_LineInterpolatePoints
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.7.4" data-path="ST_LineLocatePoint.html">
            
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                    ST_LineLocatePoint
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7.5" data-path="ST_LineSubstring.html">
            
                <a href="ST_LineSubstring.html">
            
                    
                    ST_LineSubstring
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7.6" data-path="ST_LocateAlong.html">
            
                <a href="ST_LocateAlong.html">
            
                    
                    ST_LocateAlong
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7.7" data-path="ST_LocateBetween.html">
            
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                    ST_LocateBetween
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.7.8" data-path="ST_LocateBetweenElevations.html">
            
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                    ST_LocateBetweenElevations
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.7.9" data-path="ST_InterpolatePoint.html">
            
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                    ST_InterpolatePoint
            
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        <li class="chapter active" data-level="2.1.7.10" data-path="ST_AddMeasure.html">
            
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                    ST_AddMeasure
            
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        <li class="chapter " data-level="2.1.7.11" data-path="examples.html">
            
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                    综合案例
            
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                                <h2 id="staddmeasure">ST_AddMeasure</h2>
<h3 id="&#x65B9;&#x6CD5;&#x529F;&#x80FD;&#x63CF;&#x8FF0;">&#x65B9;&#x6CD5;&#x529F;&#x80FD;&#x63CF;&#x8FF0;</h3>
<p>&#x5DF2;&#x77E5;&#x4E00;&#x6761;&#x7EBF;&#xFF0C;&#x901A;&#x8FC7;&#x5728;&#x8D77;&#x70B9;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x7EC8;&#x70B9;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x6D4B;&#x91CF;&#x503C;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x4ECE;&#x800C;&#x5BF9;&#x7EBF;&#x4E0A;&#x4EFB;&#x610F;&#x4F4D;&#x7F6E;&#x7EBF;&#x6027;&#x63D2;&#x503C;&#x4E86;&#x6D4B;&#x91CF;&#x503C;&#x3002;&#x5982;&#x679C;&#x7EBF;&#x56FE;&#x5F62;&#x6CA1;&#x6709;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x5C06;&#x6DFB;&#x52A0;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x5982;&#x679C;&#x7EBF;&#x56FE;&#x5F62;&#x5DF2;&#x6709;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x5C06;&#x4F1A;&#x88AB;&#x65B0;&#x8BA1;&#x7B97;&#x540E;&#x7684;&#x6D4B;&#x91CF;&#x503C;&#x201C;&#x66FF;&#x6362;&#x201D;&#x3002;</p>
<h3 id="&#x51FD;&#x6570;&#x5B9A;&#x4E49;">&#x51FD;&#x6570;&#x5B9A;&#x4E49;</h3>
<pre class="language-"><code>geometry ST_AddMeasure(geometry geom_mline, float8 measure_start, float8 measure_end);
</code></pre><p>&#x53C2;&#x6570;&#x5B9A;&#x4E49;&#xFF1A;</p>
<pre class="language-"><code>geom_mline&#xFF1A;&#x5BF9;&#x8F93;&#x5165;&#x7684;&#x7EBF;&#x8FDB;&#x884C;&#x6DFB;&#x52A0;&#x6D4B;&#x91CF;&#x503C;&#x64CD;&#x4F5C;&#xFF0C;&#x5FC5;&#x987B;&#x662F;LineString&#x6216;MultiLinString&#x7C7B;&#x578B;&#x3002;
measure_start:&#x6D4B;&#x91CF;&#x503C;&#x8D77;&#x70B9;&#xFF0C;&#x8BE5;&#x503C;&#x5BF9;&#x5E94;&#x8F93;&#x5165;&#x7EBF;&#x7684;&#x8D77;&#x70B9;&#x3002;
measure_end:&#x6D4B;&#x91CF;&#x503C;&#x7EC8;&#x70B9;&#xFF0C;&#x8BE5;&#x503C;&#x5BF9;&#x5E94;&#x8F93;&#x5165;&#x7EBF;&#x7684;&#x7EC8;&#x70B9;&#x3002;
</code></pre><p>&#x8FD4;&#x56DE;&#x503C;&#xFF1A;LineStringM&#x6216;MultiLinStringM&#x5E26;M&#x503C;&#x56FE;&#x5F62;&#x3002;</p>
<h3 id="api&#x793A;&#x4F8B;">API&#x793A;&#x4F8B;</h3>
<ol>
<li>LineString</li>
</ol>
<p><img src="http://localhost:4000/images/LinearReferencing/ST_AddMeasure.png" alt=""></p>
<pre class="language-"><code>SELECT ST_AsText(ST_AddMeasure(
ST_GeomFromEWKT(&apos;LINESTRING(118 32, 119 32, 121 32)&apos;),1,4)) As ewelev;

                ST_AsText
-----------------------------------------
LINESTRING M (118 32 1,119 32 2,121 32 4)
</code></pre><p>&#x7ED3;&#x8BBA;&#xFF1A;&#x6CA1;&#x6709;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x5C06;&#x4F1A;&#x5BF9;&#x7EBF;&#x6DFB;&#x52A0;&#x6D4B;&#x91CF;&#x503C;&#x3002;</p>
<ol>
<li>LineStringM</li>
</ol>
<pre class="language-"><code>SELECT ST_AsText(ST_AddMeasure(
ST_GeomFromEWKT(&apos;LINESTRINGM(118 32 7, 119 32 8, 121 32 10)&apos;),1,4)) As ewelev;

                ST_AsText
-----------------------------------------
LINESTRING M (118 32 1,119 32 2,121 32 4)
</code></pre><p>&#x7ED3;&#x8BBA;&#xFF1A;&#x5DF2;&#x6709;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x5C06;&#x4F1A;&#x7528;&#x65B0;&#x6D4B;&#x91CF;&#x503C;&#x201C;&#x66FF;&#x6362;&#x201D;&#x65E7;&#x6D4B;&#x91CF;&#x503C;&#x3002;</p>
<ol>
<li>MultiLineString</li>
</ol>
<p><img src="http://localhost:4000/images/LinearReferencing/ST_AddMeasure1.png" alt=""></p>
<pre class="language-"><code>SELECT ST_AsText(ST_AddMeasure(
ST_GeomFromEWKT(&apos;MULTILINESTRING((118 32,119 32,121 32),(118 33, 119 33, 121 33))&apos;),1,7)) As
ewelev;
</code></pre><p>&#x6CE8;&#x610F;&#xFF1A;&#x7B2C;&#x4E00;&#x4E2A;&#x5B50;&#x7EBF;&#x7684;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x70B9;&#x662F;(121 32 4)&#x4E0E;&#x7B2C;&#x4E8C;&#x4E2A;&#x5B50;&#x7EBF;&#x7B2C;&#x4E00;&#x4E2A;&#x70B9;(118,33,4)&#xFF0C;&#x6D4B;&#x91CF;&#x503C;&#x90FD;&#x662F;4&#xFF0C;&#x8FD9;&#x662F;&#x4EC0;&#x4E48;&#x539F;&#x56E0;&#xFF1F;</p>
<p>&#x539F;&#x7406;&#xFF1A;ST_AddMeasure&#x51FD;&#x6570;&#x662F;&#x628A;&#x7B2C;&#x4E8C;&#x4E2A;&#x5B50;&#x7EBF;&#x7684;&#x8D77;&#x70B9;&#x62FC;&#x63A5;&#x5230;&#x7B2C;&#x4E00;&#x4E2A;&#x5B50;&#x7EBF;&#x7684;&#x7EC8;&#x70B9;&#xFF0C;&#x90A3;&#x4E48;&#x53EF;&#x4EE5;121 32&#x548C;118 33&#x786C;&#x51D1;&#x4E00;&#x8D77;&#x4E86;&#x3002;</p>
<p>&#x90A3;&#x4E48;&#x7B2C;&#x4E8C;&#x6761;&#x5B50;&#x7EBF;(118 33, 119 33, 121 33)&#x5C31;&#x4F1A;&#x53D8;&#x6210;(121 32,122 32,124 32)&#x3002;</p>
<p><img src="http://localhost:4000/images/LinearReferencing/ST_AddMeasure2.png" alt=""></p>
<p>&#x62FC;&#x63A5;&#x5230;&#x4E00;&#x8D77;&#xFF0C;&#x7136;&#x540E;&#x8BA1;&#x7B97;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x628A;&#x6D4B;&#x91CF;&#x503C;&#x5BF9;&#x5E94;&#x5199;&#x4F1A;&#x7B2C;&#x4E8C;&#x6761;&#x5B50;&#x7EBF;&#x4E0A;&#x3002;</p>
<h3 id="&#x9519;&#x8BEF;&#x4F7F;&#x7528;&#x573A;&#x666F;">&#x9519;&#x8BEF;&#x4F7F;&#x7528;&#x573A;&#x666F;</h3>
<p>&#x65B0;&#x95FB;&#x5E7F;&#x64AD;&#x4E2D;&#x5E38;&#x5E38;&#x6709;&#x8FD9;&#x6837;&#x7684;&#x62A5;&#x9053;&#xFF1A;&#x8DDD;&#x79BB;xx&#x9AD8;&#x901F;&#x5165;&#x53E3;30&#x516C;&#x91CC;&#x5904;&#x53D1;&#x751F;&#x4EA4;&#x901A;&#x4E8B;&#x6545;&#xFF0C;&#x8FD9;&#x65F6;&#x5730;&#x56FE;&#x4E0A;&#x6709;&#x4E2A;&#x95EA;&#x52A8;&#x7684;&#x4E8B;&#x6545;&#x70B9;&#xFF0C;&#x6807;&#x660E;&#x4E8B;&#x6545;&#x5730;&#x70B9;&#x3002;&#x4E3A;&#x4E86;&#x5B9E;&#x73B0;&#x8FD9;&#x4E9B;&#x529F;&#x80FD;&#xFF0C;&#x67D0;&#x6280;&#x672F;&#x4EBA;&#x5458;&#x5BF9;&#x4E00;&#x6761;&#x9053;&#x8DEF;&#xFF0C;&#x5176;&#x56FE;&#x5F62;&#x4E3A;&#x7EBF;LineString(119 30,120.22 30.22,120.33 30.33)&#x6DFB;&#x52A0;&#x5730;&#x7406;&#x957F;&#x5EA6;&#x6D4B;&#x91CF;&#x503C;&#xFF0C;&#x8FD9;&#x6761;&#x7EBF;&#x8D77;&#x70B9;&#xFF08;&#x7B49;&#x540C;&#x9AD8;&#x901F;&#x5165;&#x53E3;&#x7684;&#x610F;&#x601D;&#xFF09;&#x4F4D;&#x7F6E;&#x4E3A;0&#xFF0C;&#x7EC8;&#x70B9;&#x8BBE;&#x7F6E;&#x4E3A;&#x7EBF;&#x7684;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#xFF0C;&#x8FD9;&#x6837;&#xFF0C;&#x5F53;&#x8BA1;&#x7B97;&#x67D0;&#x4E8B;&#x6545;&#x70B9;&#x8DDD;&#x79BB;&#x8D77;&#x70B9;&#x591A;&#x5C11;&#x7C73;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x83B7;&#x53D6;&#x70B9;&#x7684;&#x5750;&#x6807;&#x4F4D;&#x7F6E;&#x3002;</p>
<p>&#x7B2C;&#x4E00;&#x6B65;&#xFF1A;&#x8BA1;&#x7B97;&#x7EBF;&#x7684;&#x771F;&#x5B9E;&#x957F;&#x5EA6;&#xFF1A;</p>
<pre class="language-"><code>select ST_Length(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326)::geography);
    ST_Length
------------------
136231.99705736412
</code></pre><p>&#x7B2C;&#x4E8C;&#x6B65;&#xFF1A;&#x7ED9;&#x7EBF;&#x6DFB;&#x52A0;&#x6D4B;&#x91CF;&#x503C;&#xFF1A;</p>
<pre class="language-"><code>select ST_AsText(ST_AddMeasure(
ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326),0,136231.99705736412));
                                st_astext
------------------------------------------------------------------------------------
LINESTRING M (119 30 0,120.22 30.22 121042.702052768,120.33 30.33 136231.997057364)
</code></pre><p>&#x7B2C;&#x4E09;&#x6B65;&#xFF1A;&#x9A8C;&#x8BC1;&#x7ED3;&#x679C;&#xFF1A;</p>
<p>&#x5EFA;&#x7ACB;&#x6D4B;&#x91CF;&#x503C;&#x540E;&#xFF0C;[120.22 30.22]&#x70B9;&#x5904;&#x6D4B;&#x91CF;&#x503C;M&#x4E3A;121042.702052768&#x3002;</p>
<p>&#x8BA1;&#x7B97;&#x8D77;&#x70B9;&#x7EBF;&#x5230;[120.22 30.22]&#x70B9;&#x771F;&#x5B9E;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#x4E3A;120085.05682156245&#x3002;</p>
<pre class="language-"><code>select ST_Length(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22)&apos;,4326)::geography);
    ST_Length
------------------
120085.05682156245
</code></pre><p>==&#x6280;&#x672F;&#x4EBA;&#x5458;&#x7ED3;&#x8BBA;&#xFF1A;[120.22 30.22]&#x6D4B;&#x91CF;&#x503C;M&#x4E0E;&#x771F;&#x5B9E;&#x8DDD;&#x79BB;&#x4E0D;&#x4E00;&#x81F4;&#x3002;==</p>
<p><strong>&#x9519;&#x8BEF;&#x539F;&#x56E0;&#xFF1A;&#x7EC8;&#x70B9;&#x5904;&#x662F;&#x901A;&#x8FC7;geography&#x7C7B;&#x578B;&#x8BA1;&#x7B97;&#x7684;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#xFF0C;&#x4F46;&#x662F;ST_AddMeasure&#x51FD;&#x6570;&#x5165;&#x53C2;&#x53EA;&#x80FD;&#x662F;geometry&#x7C7B;&#x578B;&#xFF0C;&#x5BFC;&#x81F4;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#x7EBF;&#x6027;&#x63D2;&#x503C;&#x5230;&#x5E73;&#x9762;&#x7684;geometry&#x56FE;&#x5F62;&#x4E0A;&#xFF0C;&#x4E8E;&#x662F;&#xFF0C;&#x5728;&#x8282;&#x70B9;&#x5904;&#x5BFC;&#x81F4;&#x6D4B;&#x91CF;&#x503C;M&#x4E0E;ST_Length&#x4E0D;&#x4E00;&#x81F4;&#x3002;</strong></p>
<p>&#x9A8C;&#x8BC1;&#x60F3;&#x6CD5;&#xFF1A;&#x7EBF;&#x8DEF;&#x957F;&#x5EA6;&#x4F7F;&#x7528;&#x5E73;&#x9762;&#x957F;&#x5EA6;&#xFF0C;&#x628A;&#x5E73;&#x7EBF;&#x957F;&#x5EA6;&#x7684;&#x7ED3;&#x679C;&#x7EBF;&#x6027;&#x63D2;&#x503C;&#x5230;&#x5E73;&#x9762;&#x7EBF;&#x56FE;&#x5F62;&#x4E0A;&#xFF1A;</p>
<pre class="language-"><code>--&#x5E73;&#x9762;geometry&#x8DDD;&#x79BB;
select ST_Length(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326));
    ST_Length
------------------
139524.0869245977

--&#x5E73;&#x9762;&#x8DDD;&#x79BB;&#xFF0C;&#x6DFB;&#x52A0;&#x6D4B;&#x91CF;&#x503C;
select ST_AsText(ST_AddMeasure(
ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326),0,139524.0869245977));
                                st_astext
------------------------------------------------------------------------------------
LINESTRING M (119 30 0,120.22 30.22 123967.737738494,120.33 30.33 139524.086924598)

--&#x8D77;&#x70B9;&#x5230;[120.22 30.22]&#x5904;&#x7684;&#x5E73;&#x9762;&#x8DDD;&#x79BB;
select ST_Length(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22)&apos;,4326));
    ST_Length
------------------
123967.737738494
</code></pre><p>&#x7ED3;&#x8BBA;&#xFF1A;&#x90FD;&#x7EDF;&#x4E00;&#x4F7F;&#x7528;&#x5E73;&#x9762;&#x8DDD;&#x79BB;&#x540E;&#xFF0C;&#x7EBF;&#x6027;&#x63D2;&#x503C;&#x7684;M&#x503C;&#x4E0E;&#x5B9E;&#x9645;&#x8BA1;&#x7B97;&#x7684;&#x5E73;&#x9762;&#x957F;&#x5EA6;&#x4E00;&#x81F4;&#x3002;&#x56E0;&#x6B64;&#xFF0C;ST_AddMeasure&#x4E0D;&#x4F1A;&#x5BFC;&#x81F4;&#x8BA1;&#x7B97;&#x7ED3;&#x679C;&#x51FA;&#x73B0;&#x5DEE;&#x5F02;&#xFF0C;&#x5DEE;&#x5F02;&#x662F;&#x5E73;&#x9762;&#x7403;&#x9762;&#x7406;&#x89E3;&#x4E0D;&#x6DF1;&#xFF0C;&#x6DF7;&#x5408;&#x6742;&#x7528;&#x5BFC;&#x81F4;&#x8BA1;&#x7B97;&#x7EF4;&#x5EA6;&#x4E0D;&#x7EDF;&#x4E00;&#x5F62;&#x6210;&#x5DEE;&#x5F02;&#x3002;</p>
<p>==&#x5F15;&#x7533;&#xFF1A;&#x7136;&#x800C;&#x5E73;&#x9762;&#x8DDD;&#x79BB;&#x7684;&#x786E;&#x4E0D;&#x662F;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#xFF0C;&#x5982;&#x679C;&#x5C31;&#x662F;&#x4F7F;&#x7528;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#x8BA1;&#x7B97;&#x4F4D;&#x7F6E;&#xFF0C;&#x5982;&#x4F55;&#x8BA1;&#x7B97;&#xFF1F;&#x5047;&#x8BBE;&#x6211;&#x4EEC;&#x8981;&#x6C42;&#x8DDD;&#x79BB;&#x8D77;&#x70B9;60000&#x7C73;&#xFF08;&#x771F;&#x5B9E;&#x5730;&#x7406;&#x8DDD;&#x79BB;&#xFF0C;&#x7403;&#x9762;&#x8DDD;&#x79BB;&#xFF09;&#x7684;&#x4F4D;&#x7F6E;&#x70B9;&#x5750;&#x6807;&#x3002;==</p>
<pre class="language-"><code>--&#x5148;&#x8BA1;&#x7B97;&#x6574;&#x6761;&#x7EBF;&#x7403;&#x9762;&#x957F;&#x5EA6;
select ST_Length(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326)::geography);
    ST_Length
------------------
136231.99705736412

--&#x8BA1;&#x7B97;60000&#x7C73;&#x5360;&#x603B;&#x957F;&#x5EA6;&#x7684;&#x767E;&#x5206;&#x6BD4;&#x3002;
select 60000/136231.99705736412 as per;
         per
----------------------
0.44042516659823608027

--&#x6839;&#x636E;&#x767E;&#x5206;&#x6BD4;&#x5B9A;&#x4F4D;
SELECT ST_AsText(ST_LineInterpolatePoint(ST_GeomFromText(&apos;LineString(119 30,120.22 30.22,120.33 30.33)&apos;,4326), 0.44042516659823608027));
                 ST_AsText
---------------------------------------
POINT(119.604745257323 30.1090524234517)
</code></pre>
                                
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